The diagram shows a circle with radius 1 that rolls without slipping around the inside of a square with sides of length 5. The circle rolls once around the square, returning to its starting point. What distance does the centre of the circle travel?
Select one option, then click Submit.
16 - 2\pi
12
6 + \pi
20 - 2\pi
20
Select an option, then submit.
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Senior Mathematical Challenge 2016 (2016)
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